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Actually Nx Mobile already shows refreshing live video tiles instead of still images - but only for the live view.Of course, real performance is always limited by the video decoding hardware of your mobile.

E.g. on my personal device I can see 5-10 fps for 4 cameras. Adding more devices makes fps counter to drop that might eventually seem like still image.

Currently archived video multi-playback is not in the plans for near future.